ISO/TR 11688-2:1998 PDF

Acoustics — Recommended practice for the design of low-noise machinery and equipment — Part 2: Introduction to the physics of low-noise design

First page of standard ISO/TR 11688-2:1998

Open preview (PDF)

Title (English):

ISO/TR 11688-2:1998

Acoustics — Recommended practice for the design of low-noise machinery and equipment — Part 2: Introduction to the physics of low-noise design

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 46
Publication date:: September 3, 1998
Edition:: ISO TR 11688 edition 1 version 1
ICS:: 17.140.20

Delivery type:

Full version25 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:25 €

Description (English):

L'ISO/TR 11688-2:2002 traite du contexte physique, des règles et des exemples de conception à bruit réduit donnés dans l'ISO/TR 11688-1 et vient à l'appui d'une importante documentation spécialisée. Elle est destinée à être utilisée par les concepteurs de machines et d'équipements ainsi que par les utilisateurs et/ou acheteurs de machines et les autorités agissant dans le domaine de la législation, ou de l'inspection. Les équations indiquées dans l'ISO/TR 11688-2:2002 sont destinées à faciliter la compréhension générale de la réduction du bruit. Dans de nombreux cas, elles permettent une comparaison entre différentes versions d'une conception, mais ne sont pas utilisables pour la prévision de valeurs absolues d'émission sonore. Les informations sur les sources sonores internes, les chemins de transmission et les parties d'une machine rayonnant du bruit constituent les données de base pour la réduction du bruit des machines. C'est pourquoi, des méthodes de mesurage et des méthodes de calcul appropriées pour obtenir ces informations sont décrites aux articles 7 et 8 et à l'annexe A.

Technical details

Technical committee: ISO/TC 43/SC 1 - Noise
SKU: ISO/TR 11688-2:1998

Abstract

Overview

ISO/TR 11688-2:1998 - Acoustics - Recommended practice for the design of low-noise machinery and equipment - Part 2: Introduction to the physics of low-noise design - provides the physical background needed for effective low-noise design of machinery and equipment. This Technical Report (type 3) explains fundamentals of noise generation, transmission and radiation for airborne, liquid-borne and structure-borne sound, supporting designers, users, buyers and regulatory authorities in noise control and procurement decisions.

Key topics

Acoustical modelling: Simple block models distinguishing internal sources, transmission paths and radiating boundaries to guide noise-reduction strategies.
Fluid‑dynamic noise: Mechanisms (turbulence, pulsation, shock), elementary source models - monopoles, dipoles, quadrupoles - and influence of flow parameters (flow velocity, Mach number, source dimension).
Cavitation: Special liquid-borne phenomenon, bubble formation and implosion, and design measures to avoid cavitation-related noise.
Structure‑borne sound: Source models, internal sources, transmission paths, damping strategies and radiation from machine boundaries.
Noise control measures: Principles to reduce source strength, interrupt transmission paths, or reduce radiation (design rules illustrated by examples).
Analysis methods: Measurement-based procedures (identifying internal sources, transmission paths, radiation) and computational approaches (deterministic and statistical methods) for diagnosing and predicting noise behavior.
Practical tools: Annexes include an example estimation of airborne sound emission from component sources and a glossary of terms.

Practical applications

This report is a practical reference for:

Mechanical and acoustical engineers designing low-noise machinery, HVAC systems, pumps, fans, compressors and rotating equipment.
Product designers applying noise control early in the design process to reduce lifecycle costs and compliance risk.
Noise consultants performing machine noise audits, source-path-radiation analysis and retrofit mitigation.
Procurement teams and regulators specifying noise performance or interpreting declared sound power levels.

Practical value includes guidance on selecting mitigation measures (speed reduction, geometry changes, damping, enclosure and flow management), understanding how flow velocity strongly affects sound power (higher-order dependence), and using measurement or computational methods to prioritize interventions.

Related standards

ISO/TR 11688-1:1995 - Acoustics - Recommended practice for the design of low-noise machinery and equipment - Part 1: Planning (complements Part 2 by covering the design process and planning).

Keywords: ISO/TR 11688-2:1998, acoustics, low-noise design, machinery noise control, airborne noise, structure-borne sound, fluid-dynamic noise, cavitation, noise measurement, acoustical modelling.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics

Acoustical modelling: Simple block models distinguishing internal sources, transmission paths and radiating boundaries to guide noise-reduction strategies.
Fluid‑dynamic noise: Mechanisms (turbulence, pulsation, shock), elementary source models - monopoles, dipoles, quadrupoles - and influence of flow parameters (flow velocity, Mach number, source dimension).
Cavitation: Special liquid-borne phenomenon, bubble formation and implosion, and design measures to avoid cavitation-related noise.
Structure‑borne sound: Source models, internal sources, transmission paths, damping strategies and radiation from machine boundaries.
Noise control measures: Principles to reduce source strength, interrupt transmission paths, or reduce radiation (design rules illustrated by examples).
Analysis methods: Measurement-based procedures (identifying internal sources, transmission paths, radiation) and computational approaches (deterministic and statistical methods) for diagnosing and predicting noise behavior.
Practical tools: Annexes include an example estimation of airborne sound emission from component sources and a glossary of terms.

Practical applications

This report is a practical reference for:

Mechanical and acoustical engineers designing low-noise machinery, HVAC systems, pumps, fans, compressors and rotating equipment.
Product designers applying noise control early in the design process to reduce lifecycle costs and compliance risk.
Noise consultants performing machine noise audits, source-path-radiation analysis and retrofit mitigation.
Procurement teams and regulators specifying noise performance or interpreting declared sound power levels.

Related standards

ISO/TR 11688-1:1995 - Acoustics - Recommended practice for the design of low-noise machinery and equipment - Part 1: Planning (complements Part 2 by covering the design process and planning).

Keywords: ISO/TR 11688-2:1998, acoustics, low-noise design, machinery noise control, airborne noise, structure-borne sound, fluid-dynamic noise, cavitation, noise measurement, acoustical modelling.

ISO/TR 11688-2:1998 PDF

Technical details

Abstract

Overview

Key topics

Practical applications

Related standards

Related standards

Abstract

Overview

Key topics

Practical applications

Related standards

Related standards

Acoustics — Recommended practice for the design of low-noise machinery and equipment — Part 1: Planning

Systems and software engineering — Software life cycle processes

Asset management — Vocabulary, overview and principles

Asset management — Asset management system — Requirements

Information technology — Radio frequency identification device conformance test methods — Part 2: Test method…

Information technology — Multimedia framework (MPEG-21) — Part 22: User Description

Milk — Determination of the lactoperoxidase activity — Photometric method (Reference method)

Carbonaceous materials for the production of aluminium — Cold and tepid ramming pastes — Expansion/shrinkage…